Polling centers across much of Afghanistan are expected to open Saturday for the country’s latest round of elections.  Nearly 2,500 candidates are vying for 249 seats in Afghanistan's lower house of parliament, or "wolesi jirga."  The elections have already been postponed once, because of security concerns.  And as VOA Correspondent Sean Maroney reports from Kabul, expectations for the vote are cautious as violence worsens in the country and memories remain of widespread voter fraud allegations in previous elections.